Today is two years since the accident. She refuses to share her grief with me — or anyone. Even when she smiles, she isn’t the girl she used to be.
-- Sylv (Chapter 1)

Importance: The day of the shooting is the same day that Autumn’s mother died in an accident two years before. Sylv worries about Autumn because she knows that her girlfriend has not been the same since her mother’s death.

The first few moments after Trenton’s speeches are always a mess, with everyone tumbling over each other trying to get out, but this is far more chaotic than usual.
-- Autumn (Chapter 2)

Importance: In her section of narration, Autumn reports noticing that students are not moving out of the auditorium as quickly as they usually. She notes the atmosphere seems more chaotic, with no one moving outside the auditorium, than the minutes after assemblies usually seem.

Tyler’s reenrolling and my sister’s...
-- Tomas (Chapter 3)